Radio circuit



April 18, 1933. A, F P; STENZY 1,904,839

Y RADIO CIRCUIT Filed Oct. 50, 1950 ln/ventola 5% F 1.7 Smzy,

Patented Apr. 18, 1933 y UNITED STATES AUGUST F. L'STENZY, or BALTIMORE, MAnyLANn, AsstonoroNE-HALTQ STEPHEN nA'rAJczAx, or nAn'rii/ ronmMARYLAND y nAnIothe detector tube, for audio amplifying andpassage to the loud speaker without distor- 10 tion so that the most natural rendition will be realized.

It is also aimed to provide a circuit which is extremely sensitive and will attract the slightest or very feeble high frequency sound l waves and reproduce the same in volume from great distance. Y

The more specific objects and advantages will become apparent from a consideration of the description following taken in con- 20 nection with accompanying drawing in which the view illustrates the invention in electrical diagram.

Referring specifically to the drawing designates the input wire connected through 25 a condenser at 11 with an antenna 12 and leading through a condenser 13 to ground at 14. Such wire connects with the radio, the circuit having suitable connection with a source of electrical energy,

One or more radio frequency tubes are employed as at 15 while a detector tube is used at 16, an audio frequency tube at 17 and a rectifier tube at 18. p

A power transformer is shown' at 19 and y from one coil 20 thereof a Wire or conductor 21 extends, the same having branches 22 leading to the grid of the tubes 15 and each including a secondary coil 23 and acondenser 24. One of the secondary coils 23 is part of the. receiving coil which is completed by the primary 25, connected in the line 10.

The other secondary 23 coacts with a primary 26, forming a transformer, vand arranged in a conductor 27 including the plates of the radio frequency tubes 15 and also including a primary winding 28 of another transformer. Such conductor 27 further includes a secondary coil 29, the terminal of such wire 27 leadlng to the positive side of a filter condenser 30 and also being connected4 at alresistance lstrip- Vilhe wire i is.; also connected. to the resistance strip at of the, filter `condenser 30. f n. n A conductor 35 leadingf from conductor 21 v55 v33 and at 34is connectedtothe'negative'side vextends to the gri`d36 of the detector tube 16 and yincludes-a?secondar at37 associated with the primary 28 an ,secondary 29 and also-includes a fixed condenser; 38, anda y variable Resistance 3 9, of {the Ytype lwhich has -m no,V winding. `The grid 36has1apush-pull input@` transformer 4() for? a suitable ,audio transformerof a4 ratioof six toone, .more or less.V These connections causeftuned inductance super regeneration of theincomin 65 high frequency and picks up the regenerated radio frequency passedon fromthe radio frequencytube plates regenerated by coil 29 and passes the; lamplifierf sound waves tothe ie-vY tectortube grid 36. u 70 Aconductor 41leadsfrom the plate ofthe detector vtube 16 andv has therein the primary 42,of L ajtransformer completedl by a secondary'43, such conductor 41 `being connected at 44 to the resistancevstrip 32 and terminating 75 at thepositive side ofthe filter, condenser 30.` conductor [46, Vincluding the secondary. y43 leads to they grid 47 ofthe audio Yamplifying tube 1,7., Ffrornftheoplate 48.r of the latter, a conductor` 49 leads which may .include `the-7130 loudxz'speakertQ,fsuch conductor beingHconnected` at 51 tof-the resistance `strip 32 and terminating/at thepositiv'e` sideof the filter condenser 30. VA continuous-"conductor 52 includesgthefilamentf of'eachof thetubes 35 l 15,16, ;,l71a11d.-118.and`alsoalboil 53 0f the power transformer 19. From the conductor v52, aconducto-r 54 leads, having choke coils 55 therein to protect the loud speaker 50, b and also having therein a variable high re- 90 sistance 56 associated witha conductor .57 connected at 58 to the resistance strip 32 and at its other end terminatingat the positive side of the filter condenser 30. Also a wire 59 extends from the conductor 54 to such 95 positive side of condenser 30 and from thev same side of said condenser 30, a Wire or con- A ductor 60 extends to a 'Contact 6l adjacent the resistance strip 32. Conductors 62 also extendfrom thewire 21 to the filaments 53 lof, 100

the conductor tubes 15 and detector tube 16.- F rom the plate 62 of the rectier tube 18, a conductor 63 extends to the coil 20 and from the latter a conductor 64 extends to the grid 65 of said rectifler tube 18. l v Various changes may be resorted to provided they fall Within the spirit and scope of the invention.

I claim as my invention 1. InY a radio receivingcircuit, a pluralityl of indirectly heated cathode tubes, a rectier tube having a tilamentary cathode, means for energizing the cathodes of all of said tubes comprising a series circuit -including the heater elements of said indirectly heated [cathode tubes, the cathode of said rectifier tubel and a source of alternating current, means Yfor energizing the anode circuits of the indirectly heated cathode tubes from a ".29 source of alternating current which is rectified by said rectiiier tube.

2. In a radio receiving circuit, a plurality of indirectly heated cathodeftubes consisting of a radio frequency tube anda de- .95 tector tube, a rectifier tube having a ila-Y mentary cathode, means for energizing the cathodes of all of said tubes comprising a series circuit including the heater elements of said indirectly heated cathode tubes, the

39 cathode of said rectifier tube and a source of alternating current, means for energizing the anode circuits of the indirectly heated-cathode tubes from a source of alternat- Ving current which is rectified by said vrectifier tube. Y v

3. In a radio receiving circuit, a plurality of indirectly heated cathode tubes consisting of a radio frequency tube, a detector tube, and an audio frequency tube, a rectifier -49 tubehaving a lamentary cathode, means for'energizing the cathodes of all of said tubes comprising a series circuit including the heater elements of'said indirectly heated cathode tubes, the cathode of said rectifier ,45 tube and a source of alternating current,

means for energizing the anode circuits of Vthe indirectlyv heated cathode tubes from aY source of alternating current which is rectilied by said rectier tube.

50 testimony whereof I aiiix my signature.

AUGUST F. P. STENZY.

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